Unfortunately, there aren't any steals in "usable" tape drives. Yes, some small businesses can make use of DDS3 or DDS4 tapes. Or, maybe DAT72. But not that many. And very PC enthusiasts have so "little" data that it will all fit on one or two DDS4 tapes.
The tape drives that start to get into really "practical" capacities for most enthusiasts are pricey (read $1000-range), even as used items. Not to mention the tapes and the required SCSI controller and cabling....